Satou, an ordinary male student, was unable to confess his love to his childhood friend, Hime, but one day she suddenly announces she's moving far away. Satou chases after Hime and follows her through a gate of light into another world known as Arnulus!

Satou has married Hime and become the legendary Ring King who will save Arnulus from the threat of the Abyss King. They struggle to advance their relationship, but there's no time to enjoy their newlywed life as the Abyss King's pursuers close in.

Satou and the others have arrived in the elven homeland of Romca, the Land of Wind where he plans to marry Nefritis, princess of the Ring of Wind. Due to her shy nature, Nefritis vehemently refuses her marriage to Satou.

With the belief that the Abyss King's armies are closing in, Alabaster suggests they postpone Satou's marriage to Nefritis and head to another country. As they're departing an Abyss King's knight makes it past the barrier and attacks Romca.

Satou visits Maasa, the Land of Water, and unexpectedly ends up marrying Saphir, the Ring Princess. Saphir believes she needs the Ring King's power to save her homeland from being controlled by the Gisaras Empire.

The oracle who's secretly running Maasa the Land of Water offers some advice to Marse who failed in his mission. Satou and Sluder prepare to repel the approaching Abyss King's horde. As Satou struggles, a certain person suddenly stands before him.

Satou and his friends have arrived in Satou's world with no way to return to Arnulus. Satou suffers from being unable to fulfill his duty as Ring King when Amber, the Ring Princess of Idanokan, the Land of Earth, appears before him.

Satou and his friends return to Arnulus among countless corpses of imperial soldiers and monsters. Satou encounters the Abyss King in a hopeless situation. Using the Ring Princesses' power he challenges the Abyss King in a confrontation to save Arnulus!